Randomization: Following assessment, subjects will be pseudo-randomized into either the mirror retraining treatment group or the crooked mirror treatment group. Pseudo-randomization means that subjects will first be assigned to one of the two groups randomly, then group membership will be remixed if needed to assure that there is no significant between-group difference in pretreatment BDD-YBOCS scores. If possible, groups will also be matched for age and gender.